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(CBS News) – A study by The Leapfrog Group shows that out of 49 states, Massachusetts and Maine have the most “A” grade hospitals at 83 and 80 percent respectively. Trailing at the bottom of the class are New Mexico’s hospitals: Only seven percent of the state’s establishments make the top grade.

At least 180,000 Americans die from hospital accidents, errors and infections, The Leapfrog Group claims. In addition to releasing their findings, they have created an app that allows people to check the grade of the nearest hospital using GPS capabilities.

For the Hospital Safety Score, hospitals were given a grade of A, B, C, D or F using data from the Leapfrog Hospital Survey, the Agency for Healthcare Research and Quality (AHRQ), the Centers for Disease Control and Prevention (CDC) and the Centers for Medicare and Medicaid Services (CMS). Information from the American Hospital Association’s Annual Survey was also used to add bonus percentage points for safety.